2000 Fiscal Year Annual Research Report

安定な芳香族置換ニトロキシド類を用いた高Tc磁性体や磁性導体の開発

Research Project

Project/Area Number	12020219
Research Institution	The University of Electro-Communications
Principal Investigator	石田尚行電気通信大学, 電気通信学部, 助教授 (00232306)
Keywords	ピリミジン / 有機ラジカル / 有機強磁性体 / 磁気的相転移 / 分子性磁性体
Research Abstract	本研究は、高い転移温度を有する分子性磁性体や、磁性と関連した複合材料の開発が主眼である。芳香族置換基を有するニトロキシドラジカルを、有機ラジカル系強磁性体の構築のために用いた。また、複素芳香族置換基を遷移金属錯体の配位子として用いた。純粋な有機化合物からなる磁性体の構築のために、ジフェニルニトロキシドラジカル類の磁性体への応用を検討したところ、分子間で強磁性的相互作用を与える系が比較的多いことがわかった。そのような背景からスピロビアクリジン-N,N'-ジオキシルを設計し、合成した。ピリミジン架橋(PM)を用いた錯体の分子性磁性体の開発を進めた。アニオンにも磁気カップラーとして機能させる目的で、π共役系1価アニオンであるN(CN)_2^-を導入した。PM・M[N(CN)_2]_2(M=Fe,Co,Ni)の結晶構造は同形であり、磁気測定によれば、転移温度はそれぞれ3.2,1.8,8.4Kであった。前の二者は弱強磁性挙動を示した。ラジカル置換基としてニトロニルニトロキシド(NN)を選び、それを4位あるいは5位に有するPM架橋の利用を検討した。[4PMNN・CuX_2]_6(X=Cl,Br)は、12スピン系大員環状の分子構造を有し、結晶中ではカラムを形成する。チューブ状空間にゲスト分子を取り込ませたところ、強磁性的相互作用が増大した。すなわち、分子磁性をホスト-ゲスト化学などにより超分子的に制御する可能性が示された。複素環としてピラジンを用いたもののなかにも、磁気的に興味深い物質が得られた。

Research Products

(18 results)

All Other

All Publications (18 results)

[Publications] T.Ishida 他6名: "Zero-Field Muon Spin Rotation Study on Genuine Organic Ferromagnets, 4-Arylmethyleneamino-2,2,6,6-tetramethylpiperidin-1-yloxyls"Chemical Physics Letters. 330. 110-117 (2000)
[Publications] R.Feyerherm 他7名: "Magnetic-Field Induced Gap and Staggered Susceptibility in the S=1/2 Chan [PM.Cu(NO_3)_<2.>(H_2O)_2]_n (PM=Pyrimidine),"Journal of Physics : Condensed Matters. 12. 8495-8509 (2000)
[Publications] M.Yasui 他4名: "The Experimental Deformation Electron-Density Distributions of 4-Arylmethyleneamino-2,2,6,6-tetramethyl-1-piperidyloxyl (TEMPO) Radicals : ..."Bulletin of the Chemical Society of Japan. 73. 1333-1340 (2000)
[Publications] Y.Pontillon 他6名: "Spin Density of a Ferromagnetic Tempo Derivative : Polarized Neutron Investigation and Ab Initio Calculation"Journal of Materials Chemistry. 10. 1539-1546 (2000)
[Publications] T.Miyake 他4名: "One-Dimensional S=1 Ferromagnetic Chain Formed by a Squara Ni_2S_2 Motif in Ni(qt)_2 (qt=Quinoline-8-thiolate)"Chemistry Letters. 952-953 (2000)
[Publications] T.Kusaka 他4名: "Low-Temperature Magnets M[N(CN)_2]_2 (pyrimidine) (M=Fe and Co) with a 3-D Network"Chemistry Letters. 1146-1147 (2000)
[Publications] S.Ohira 他5名: "μSR Studies on the Organic Radical Magnet, 4-Arylmethyleneamino-TEMPO"Physica B. 289-290. 123-127 (2000)
[Publications] K.Zusai 他5名: "SMagnetism of Pyrimidine-Bridged Metal(II) Halide Complexes"Molecular Crystals and Liquid Crystals. 343. 127-132 (2000)
[Publications] K.Zusai 他3名: "Magnetic Phase Transition of Py_2N^- and NCNH^--Bridged Nickel(II) Complexes at about 25 K"Molecular Crystals and Liquid Crystals. 343. 121-126 (2000)
[Publications] K.Tanaka 他4名: "First TOF Donors. Synthesis and Characterization of Dibenzo- and Dinaphthotetraoxafulvalenes"Advanced Materials. 12. 661-664 (2000)
[Publications] M.Mito 他5名: "Pressure Effects of Genuine Organic Crystalline Ferromagnet possessing intermolecular contacts between nitroxide oxygen and methyl hydrogen atoms"Chemical Physics Letters. 333. 69-75 (2001)
[Publications] T.Suzuki 他8名: "Single-Component Organic Semiconductors Based on Novel Radicals that Exhibit Electrochemical Amphotericity : ..."Journal of Organic Chemistry. 66. 216-224 (2001)
[Publications] M.Yasui 他5名: "Dipyrimidine-Cu(II) dinitrate complexes showing magnetic interations"Acta Crystallographicas Sect.B. (印刷中). (2001)
[Publications] J.Omata 他4名: "Radical-Copper Wheels : Structure and Magnetism of Hexanuclear Hybrid Arrays"Inorganic Chemistry. (印刷中). (2001)
[Publications] T.Nogami 他3名: "Synthesis and Properties of New Oxygen-Containing Fulvalene Derivatives : Dibenzo- and Dinaphthotetraoxafulvalenes and Dibenzodioxadithiafulvalene"Synthetic Metals. (印刷中). (2001)
[Publications] J.Omata 他4名: "Radical-Copper Hexanuclear Arrays Showing Ferromagnetic Interactions"Polyhedron. (印刷中). (2001)
[Publications] T.Miyake 他4名: "Ferromagnetic S=1 Chain Formed by a Square Ni_2S_2 Motif in Ni(qt)_2 (qt=Quinoline-8-thiolate). Magnetic Properties of Related Compounds"Polyhedron. (印刷中). (2001)
[Publications] T.Ishida 他4名: "Zero-Field Muson Spin Rotation Study on TEMPO-Based Magnets, Ar-CH=N-TEMPO"Polyhedron. (印刷中). (2001)

2000 Fiscal Year Annual Research Report

安定な芳香族置換ニトロキシド類を用いた高Tc磁性体や磁性導体の開発

Principal Investigator

石田 尚行 電気通信大学, 電気通信学部, 助教授 (00232306)

Research Products

[Publications] T.Ishida 他6名: "Zero-Field Muon Spin Rotation Study on Genuine Organic Ferromagnets, 4-Arylmethyleneamino-2,2,6,6-tetramethylpiperidin-1-yloxyls"Chemical Physics Letters. 330. 110-117 (2000)

[Publications] R.Feyerherm 他7名: "Magnetic-Field Induced Gap and Staggered Susceptibility in the S=1/2 Chan [PM.Cu(NO_3)_<2.>(H_2O)_2]_n (PM=Pyrimidine),"Journal of Physics : Condensed Matters. 12. 8495-8509 (2000)

[Publications] M.Yasui 他4名: "The Experimental Deformation Electron-Density Distributions of 4-Arylmethyleneamino-2,2,6,6-tetramethyl-1-piperidyloxyl (TEMPO) Radicals : ..."Bulletin of the Chemical Society of Japan. 73. 1333-1340 (2000)

[Publications] Y.Pontillon 他6名: "Spin Density of a Ferromagnetic Tempo Derivative : Polarized Neutron Investigation and Ab Initio Calculation"Journal of Materials Chemistry. 10. 1539-1546 (2000)

[Publications] T.Miyake 他4名: "One-Dimensional S=1 Ferromagnetic Chain Formed by a Squara Ni_2S_2 Motif in Ni(qt)_2 (qt=Quinoline-8-thiolate)"Chemistry Letters. 952-953 (2000)

[Publications] T.Kusaka 他4名: "Low-Temperature Magnets M[N(CN)_2]_2 (pyrimidine) (M=Fe and Co) with a 3-D Network"Chemistry Letters. 1146-1147 (2000)

[Publications] S.Ohira 他5名: "μSR Studies on the Organic Radical Magnet, 4-Arylmethyleneamino-TEMPO"Physica B. 289-290. 123-127 (2000)

[Publications] K.Zusai 他5名: "SMagnetism of Pyrimidine-Bridged Metal(II) Halide Complexes"Molecular Crystals and Liquid Crystals. 343. 127-132 (2000)

[Publications] K.Zusai 他3名: "Magnetic Phase Transition of Py_2N^- and NCNH^--Bridged Nickel(II) Complexes at about 25 K"Molecular Crystals and Liquid Crystals. 343. 121-126 (2000)

[Publications] K.Tanaka 他4名: "First TOF Donors. Synthesis and Characterization of Dibenzo- and Dinaphthotetraoxafulvalenes"Advanced Materials. 12. 661-664 (2000)

[Publications] M.Mito 他5名: "Pressure Effects of Genuine Organic Crystalline Ferromagnet possessing intermolecular contacts between nitroxide oxygen and methyl hydrogen atoms"Chemical Physics Letters. 333. 69-75 (2001)

[Publications] T.Suzuki 他8名: "Single-Component Organic Semiconductors Based on Novel Radicals that Exhibit Electrochemical Amphotericity : ..."Journal of Organic Chemistry. 66. 216-224 (2001)

[Publications] M.Yasui 他5名: "Dipyrimidine-Cu(II) dinitrate complexes showing magnetic interations"Acta Crystallographicas Sect.B. (印刷中). (2001)

[Publications] J.Omata 他4名: "Radical-Copper Wheels : Structure and Magnetism of Hexanuclear Hybrid Arrays"Inorganic Chemistry. (印刷中). (2001)

[Publications] T.Nogami 他3名: "Synthesis and Properties of New Oxygen-Containing Fulvalene Derivatives : Dibenzo- and Dinaphthotetraoxafulvalenes and Dibenzodioxadithiafulvalene"Synthetic Metals. (印刷中). (2001)

[Publications] J.Omata 他4名: "Radical-Copper Hexanuclear Arrays Showing Ferromagnetic Interactions"Polyhedron. (印刷中). (2001)

[Publications] T.Miyake 他4名: "Ferromagnetic S=1 Chain Formed by a Square Ni_2S_2 Motif in Ni(qt)_2 (qt=Quinoline-8-thiolate). Magnetic Properties of Related Compounds"Polyhedron. (印刷中). (2001)

[Publications] T.Ishida 他4名: "Zero-Field Muson Spin Rotation Study on TEMPO-Based Magnets, Ar-CH=N-TEMPO"Polyhedron. (印刷中). (2001)

石田尚行電気通信大学, 電気通信学部, 助教授 (00232306)